It's not like Metallica were the first ones to do that. You can buy the Queen Symphony though. And then of course all those releases by the Royal Phil Orc playing Queen. That should help you through the night.

KISS Symphony is absolutely great!!!! All the orchestra members were in KISS make up!!!! Maybe, the only thing I don´t like, was that they play with their instruments. I mean they shouldn´t play any electric instrument, as in an unplugged. Sometimes the orchestra doesn´t hear because of the sound of their instruments :o(